diff --git a/build/gen.py b/build/gen.py
index 0c5630f..969cccd 100755
--- a/build/gen.py
+++ b/build/gen.py
@@ -224,7 +224,7 @@
                     help='Enable the use of UndefinedBehaviorSanitizer')
   args_list.add('--no-last-commit-position', action='store_true',
                     help='Do not generate last_commit_position.h.')
-  args_list.add('--out-path', type=str,
+  args_list.add('--out-path', type=os.path.abspath,
                     default=os.path.join(REPO_ROOT, 'out'),
                     help='The path to generate the build files in.')
   args_list.add('--no-strip', action='store_true',
@@ -480,6 +480,28 @@
       ] if options.starlark else []),
   )
 
+  ninja.Phony(
+      'check_all',
+      inputs=[
+          ninja.RunBinary(
+              'check_formatter',
+              inputs=[ninja.source_file('tools/run_formatter.sh')],
+              implicit_inputs=ninja.directory(ninja.source_file('src'), ['target']),
+              args='--diff',
+          ),
+          ninja.RunBinary(
+              'check_reference',
+              inputs=[ninja.source_file('tools/update_reference.sh')],
+              implicit_inputs=[
+                  'gn' + platform.exe_suffix,
+                  ninja.source_file('docs/reference.md'),
+              ],
+              args='--diff',
+              env=f'NOBUILD=1 NINJA_OUT_DIR={os.path.relpath(build_dir, REPO_ROOT)}',
+          ),
+      ],
+  )
+
   with open(path, 'w') as f:
     f.write('\n'.join(ninja_header_lines))
     f.write(ninja_template)
diff --git a/build/ninja_file.py b/build/ninja_file.py
index f7fcb6c..8c6672d 100644
--- a/build/ninja_file.py
+++ b/build/ninja_file.py
@@ -108,7 +108,7 @@
         name='run_binary',
         ninja_file=self,
         command=self.chain(
-            f'{build_prefix}$in $args', python('tools/touch.py', '$out')
+            f'$env {build_prefix}$in $args', python('tools/touch.py', '$out')
         ),
         description='RUN BINARY $in',
     )